Purchase Order Page -Dispacth details....

whenever I select the vendor id in the PurchaseOrders page it populates the default dispatch method set to the vendor...
now my requirement is like when this default dispatch method(if fax method and no fax number specified or if email and if no emailid specified)it should throw the warning message immediately when i send the vendor id...
How can i implement this???

whenver a dispatch method is set to the vendor on the vendor_loc
table it is defaulted as the disp method...else it picks the
disp method set fot the setid of the vendor....

now my case is when i enter a value for the vendor it should
throw an error message if the fax is not available and the disp
method is default...and when emailid is not available and the
disp method is dafault...also i should not further allow the
user to make changes on the page..may be i should grau out the
page...how can i do it??

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